diff change can be a bitch of a job or can be easy.

i've done it a couple of times recently so can offer some advice

the long bolt through the bottom will probably be seized in. try and get that one out first of all (after removing prop shaft if you like)

to undo the bolts in the propshaft (15mm head) you can shove a bar through the UJ to stop it turning. undo one of the prop shaft centre bolts completely, and the other one a bit and then the propshaft can be dropped out of the way.

you need a t50 torx bit for the driveshaft bolts. they will probably be full of old grease, so clean that out of the heads before attempting to undo them so that the torx bit fits well and you don't round them off.

the beam needs supporting with axle stands, it's no good jsut having the car up on axle stands, as the beam will want to drop when you take the diff out.

support the diff with a trolley jack after you've got the long bolt out, and then you can remove the rubber mount of the back of the diff before taking out the 4 short bolts that hold the diff to the beam.

before putting the diff back on, run a tap down all 4 threads and take a round file to the holes in the aluminium where the long bolt goes through to make it easy to slide through.

hope that helps